MethodLegitimate useLimitAbsence of causeNegation when the cause is exclusiveFails if other causes may applyIstishabDefensive protection of an established stateDoes not alone create new rights
Both methods require fidelity to the actual reach of the evidence. Without exclusivity one cannot infer universal absence of a ruling; without fresh evidence one cannot transform a prior state into unlimited affirmative claims.
The core skill is not merely naming doctrines but assessing exactly what conclusion a given premise can support.